Scholarlink

<p>The 9‰ increase in seawater lithium isotope (δ<sup>7</sup>Li) during the Cenozoic is widely regarded as evidence for uplift-driven enhancement of continental silicate weathering. Yet, the absence of long-term direct riverine δ<sup>7</sup>Li records has left this hypothesis largely untested. Given that the Tibetan Plateau contributes 16% of the modern global riverine Li flux, we present δ<sup>7</sup>Li records of paleowater spanning the past 15 million years covering the southern humid and northern arid Tibetan Plateau. Paleowater δ<sup>7</sup>Li reveals long-term decreases for the northern plateau, and low values for the southern plateau, reflecting a decrease in silicate weathering intensity in response to climatic cooling and high exhumations. Integrating our δ<sup>7</sup>Li record into a global Li cycle model, our study indicates that continental silicate weathering from tectonically active mountains is unlikely to have accounted for the observed rise in seawater δ<sup>7</sup>Li. These findings urge reconsideration of how tectonic uplift affects the chemistry of the ocean and carbon cycle.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Decoupling of Neogene seawater lithium isotopes from uplift-driven weathering

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月15日

查看全文
  • Yibo Yang,
  • Yudong Liu,
  • Philip A. E. Pogge von Strandmann,
  • Zhangdong Jin,
  • Albert Galy,
  • Chengcheng Ye,
  • Mebrahtu F. Weldeghebriel,
  • Zhongyi Yan,
  • Jiajun He,
  • Long-Fei Gou,
  • Li Deng,
  • Weilin Zhang,
  • Andreas Koutsodendris,
  • Jörg Pross,
  • Xiaomin Fang

摘要

The 9‰ increase in seawater lithium isotope (δ7Li) during the Cenozoic is widely regarded as evidence for uplift-driven enhancement of continental silicate weathering. Yet, the absence of long-term direct riverine δ7Li records has left this hypothesis largely untested. Given that the Tibetan Plateau contributes 16% of the modern global riverine Li flux, we present δ7Li records of paleowater spanning the past 15 million years covering the southern humid and northern arid Tibetan Plateau. Paleowater δ7Li reveals long-term decreases for the northern plateau, and low values for the southern plateau, reflecting a decrease in silicate weathering intensity in response to climatic cooling and high exhumations. Integrating our δ7Li record into a global Li cycle model, our study indicates that continental silicate weathering from tectonically active mountains is unlikely to have accounted for the observed rise in seawater δ7Li. These findings urge reconsideration of how tectonic uplift affects the chemistry of the ocean and carbon cycle.